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Piezoelectricity

Explore the fascinating world of piezoelectricity discovered by Pierre and Jacques Curie in 1881. Learn about the piezoelectric effect, current generation by compression, and ion generation through demonstrations like the cellophane and nylon strings experiment. Discover the polarization equation Pi = dijkσjk and how it relates to this phenomenon.

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Piezoelectricity

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  1. Piezoelectricity GLY 4200 – Lecture 3 –Fall, 2012

  2. Pierre and Jacques Curie • Pierre and Jacques Curie discovered piezoelectricity in 1881

  3. Piezoelectric Effect Diagram

  4. Illustration of Piezoelectric Effect • Generation of current by compression

  5. Lighting a Neon Bulb • Demonstration of piezoelectricity

  6. Ion Generation • Cellophane is wrapped around nylon strings and pulled down • The strings repel each other • A gun, containing a piezoelectric crystal, is aimed at the string • Pulling the trigger causes the gun to emit positive ions • Negative ions are emitted when the trigger is released • When the trigger is released, the strings relax

  7. Polarization • Pi = dijkσjk • where • Pi is the polarization vector, • dijk is the piezoelectric modulus, and • σjk is the stress tensor

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